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5.0
PH 346 - EXAM 1 REVIEW2025- 2026 QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) /ALREADY GRADED A+
Quiz: Describe the first 14 days of life, compared to the second 14 days
of life.
Ans: First 14: the egg is fertilized and implants
Second 14: the embryo begins to develop neural basis and heart
Quiz: Why are the second 14 days of life so critical?
Ans: Because the nervous system and the heart begin to develop
Quiz: Explain: implantation, formation of germ layers:
Ans: Implantation: the attachment of a fertilized egg to the wall of the
uterus at the beginning of a pregnancy
Formation of germ layers: germ layers develop early in embryonic life,
through a process called gastrulation. During this process, a hollow
cluster of cells called a blastula form two primary germ layers—the
endoderm and the ectoderm.
Quiz: When do the heart and nervous system develop?
Ans: The heart begins to form around 18 to 19 days after fertilization and
begins to beat/pump at around 21 to 22. The nervous system begins to
lay its foundation roughly 16 days after fertilization and will eventually
begin to form a neural tube.
,Quiz: What is a syncytiotrophoblast?
Ans: It is an epithelial covering on the wall of the uterus that determines
what substances will/will not be transferred across the placenta from
mother to fetus. Helps to establish blood vessels and begins to
produces hCG hormone (the one detected in pregnancy tests)
Quiz: When is the phenomenon of implantation complete?
Ans: Implantation occurs when a fertilized egg attaches itself to the wall of
the uterus. It is complete around 10-14 days after fertilization.
Quiz: How long does a fertilized zygote stay in the human reproductive
tract?
Ans: About 5-6 days, until the trophoblast (egg) adheres to the uterine wall.
Quiz: Describe gastrulation in humans:
Ans: Gastrulation begins at about day 15 after fertilization, after cleavage
takes place. The cells in the blastula (hollow ball of cells embryo)
rearrange themselves to create 3 different layers of cells that are
responsible for later developing into certain body systems.
Quiz: Describe the 3 germ layers. Which of the 3 layers gives rise to the
nervous system?
Ans: Endoderm (inner layer): gives rise to inner linings in the body (gut)
Mesoderm (middle layer): gives rise to the heart, blood vessels, muscles
Examstudy - Stuvia US
, Ectoderm (outer layer): gives rise to the nervous system
Quiz: Describe neurulation and neural tube formation.
Ans: Neurulation: A process in which the neural plate bends up and later
fuses to form the hollow tube that will eventually differentiate into the
brain and the spinal cord of the central nervous system.
Neural tube formation: Occurs 17-30 days after fertilization. neural folds pinch
in towards the midline of the embryo and fuse together to form the
neural tube
Quiz: What is spina bifida? Neural tube closure failures?
Ans: Spina bifida: a birth defect that occurs when the spine and spinal
cord don't form properly and failed to close all the way during
development.
Neural tube closure failures: failure of the neural tube to close during
neurulation. May cause problems with brain development
(anencephaly) or spinal cord (spina bifida)
Quiz: How many eggs does a female human have throughout the life
course? Is this too many or not enough?
Ans: Born with nearly 1-2 million eggs, but approximately 11,000 of them
die each month prior to puberty and only 300,000 remain by the
puberty begins. Only 300-400 of them will be ovulated during a
woman's reproductive lifetime.
Examstudy - Stuvia US
In today's fast-paced educational landscape, students need reliable resources to excel in their studies.
5.0
PH 346 - EXAM 1 REVIEW2025- 2026 QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) /ALREADY GRADED A+
Quiz: Describe the first 14 days of life, compared to the second 14 days
of life.
Ans: First 14: the egg is fertilized and implants
Second 14: the embryo begins to develop neural basis and heart
Quiz: Why are the second 14 days of life so critical?
Ans: Because the nervous system and the heart begin to develop
Quiz: Explain: implantation, formation of germ layers:
Ans: Implantation: the attachment of a fertilized egg to the wall of the
uterus at the beginning of a pregnancy
Formation of germ layers: germ layers develop early in embryonic life,
through a process called gastrulation. During this process, a hollow
cluster of cells called a blastula form two primary germ layers—the
endoderm and the ectoderm.
Quiz: When do the heart and nervous system develop?
Ans: The heart begins to form around 18 to 19 days after fertilization and
begins to beat/pump at around 21 to 22. The nervous system begins to
lay its foundation roughly 16 days after fertilization and will eventually
begin to form a neural tube.
,Quiz: What is a syncytiotrophoblast?
Ans: It is an epithelial covering on the wall of the uterus that determines
what substances will/will not be transferred across the placenta from
mother to fetus. Helps to establish blood vessels and begins to
produces hCG hormone (the one detected in pregnancy tests)
Quiz: When is the phenomenon of implantation complete?
Ans: Implantation occurs when a fertilized egg attaches itself to the wall of
the uterus. It is complete around 10-14 days after fertilization.
Quiz: How long does a fertilized zygote stay in the human reproductive
tract?
Ans: About 5-6 days, until the trophoblast (egg) adheres to the uterine wall.
Quiz: Describe gastrulation in humans:
Ans: Gastrulation begins at about day 15 after fertilization, after cleavage
takes place. The cells in the blastula (hollow ball of cells embryo)
rearrange themselves to create 3 different layers of cells that are
responsible for later developing into certain body systems.
Quiz: Describe the 3 germ layers. Which of the 3 layers gives rise to the
nervous system?
Ans: Endoderm (inner layer): gives rise to inner linings in the body (gut)
Mesoderm (middle layer): gives rise to the heart, blood vessels, muscles
Examstudy - Stuvia US
, Ectoderm (outer layer): gives rise to the nervous system
Quiz: Describe neurulation and neural tube formation.
Ans: Neurulation: A process in which the neural plate bends up and later
fuses to form the hollow tube that will eventually differentiate into the
brain and the spinal cord of the central nervous system.
Neural tube formation: Occurs 17-30 days after fertilization. neural folds pinch
in towards the midline of the embryo and fuse together to form the
neural tube
Quiz: What is spina bifida? Neural tube closure failures?
Ans: Spina bifida: a birth defect that occurs when the spine and spinal
cord don't form properly and failed to close all the way during
development.
Neural tube closure failures: failure of the neural tube to close during
neurulation. May cause problems with brain development
(anencephaly) or spinal cord (spina bifida)
Quiz: How many eggs does a female human have throughout the life
course? Is this too many or not enough?
Ans: Born with nearly 1-2 million eggs, but approximately 11,000 of them
die each month prior to puberty and only 300,000 remain by the
puberty begins. Only 300-400 of them will be ovulated during a
woman's reproductive lifetime.
Examstudy - Stuvia US
